I could use some advice on a wall. I've got a decent-sized solo maintenance operation (60+ resid/comm accounts) and do 8-10 sod installs per year, half a dozen raised beds etc...but this would be my first retaining wall. The proposed wall is 76' long, tapering from a high center of 4-5' to less than 2' at each end. They want to use 6'x6' pressure treated w/deadmen to save on materials/labor associated with block...knowing full well it won't last nearly as long. Do the same principles apply for wood walls as stone? I should compact a base, level and bury the first course, backfill with gravel, add drainage etc...? I'm wondering about the spacing of deadmen (this is clay soil, not retaining a severe slope) and any vertical support posts I might need? The wall would look much cleaner, IMO without vertical posts (which seem to turn a retaining wall into a glorified fence) but I would defer to someone with greater experience in this area... I'm trying to expand my business to include more landscape work...getting tired of mowing all day, but like to take things slowly and make sure my education and experience are sufficient for each new job. Thanks for any suggestions.